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Americans are generally in the dark when it comes to the most efficient ways to save energy, U.S. researchers say. A survey by Columbia University researchers found the majority believe they can save energy with small changes in lifestyles, while completely underestimating the major effects of changing over to efficient, currently available technology, a university release said Monday. The largest group, nearly 20 percent, said turning off lights was the best approach -- an action that affects energy budgets relatively little, researchers say.